Tungsten oxide powder, which is easy to form a non-standard stoichiometry, is a wide band gap semiconductor with an optical band gap of about 3.00eV. It can be used to prepare tungsten oxide film and then used to assemble an electrochromic device. And the performance of the prepared device is strongly dependent on the method and conditions of preparation of the raw material tungsten oxide.
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Among them, experts said that the injection of ions, which is equivalent to semiconductor doping, makes WO3 film have a colored state, changing from transparent to deep blue. Its room temperature conductivity can be changed from 10^-10s/cm to 10^3s/cm, the refractive index is changed from 1.75 to 2.8, and the optical band gap increased from 2.9eV to 3.2eV, resulting in significant changes in electrochromic efficiency and electrochromic response. That is to say, semiconductor doping or ion injection can improve the electrochromic performance of the tungsten oxide electrochromic device.
